Question

Whales have what seem like remnants of a pelvis and femur, as shown here. What are these structures an example of?

Answer 1

the answer is the the third one for thoughs who have E2020

Step-by-step explanation:

Answer 2

They're vestigial structures (meaning they're "left over" from some ancestor species of the whale). In the whale's ancestor species, the pelvis and femur were functional; over time, as the whale started living in the ocean and they became unnecessary, the pelvis and femur shrunk into what they are now.